| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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David, Laurent
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (36/36 displayed)
- 20223D Printing of Cellulase-Laden Cellulose Nanofiber/Chitosan Hydrogel Composites: Towards Tissue Engineering Functional Biomaterials with Enzyme-Mediated Biodegradationcitations
- 2022In-situ coupled mechanical/electrical investigations on conductive TPU/CB composites: Impact of thermo-mechanically induced structural reorganizations of soft and hard TPU domains on the coupled electro-mechanical propertiescitations
- 2022In situ coupled mechanical/electrical/WAXS/SAXS investigations on ethylene propylene diene monomer resin/carbon black nanocompositescitations
- 2022Pure Chitosan Biomedical Textile Fibers from Mixtures of Low- and High-Molecular Weight Bidisperse Polymer Solutions: Processing and Understanding of Microstructure–Mechanical Properties’ Relationshipcitations
- 2021Development of Bioinspired Functional Chitosan/Cellulose Nanofiber 3D Hydrogel Constructs by 3D Printing for Application in the Engineering of Mechanically Demanding Tissuescitations
- 2021Development of Bioinspired Functional Chitosan/Cellulose Nanofiber 3D Hydrogel Constructs by 3D Printing for Application in the Engineering of Mechanically Demanding Tissuescitations
- 2020In situ synthesis of Fe 3 O 4 nanoparticles coated by chito-oligosaccharides: physico-chemical characterizations and cytotoxicity evaluation for biomedical applicationscitations
- 2019Fabrication and characterization of hardystonite-chitosan biocomposite scaffoldscitations
- 2018Lubrication and Wear Protection of Micro-Structured Hydrogels Using Bioinspired Fluidscitations
- 2016Extensively deacetylated high molecular weight chitosan from the multistep ultrasound-assisted deacetylation of beta-chitincitations
- 2015Fine microstructure of processed chitosan nanofibril networks preserving directional packing and high molecular weightcitations
- 2015Covalently-crosslinked mucin biopolymer hydrogels for sustained drug deliverycitations
- 2013Phosphorylated silica/polyamide 6 nanocomposites synthesis by in situ sol-gel method in molten conditions: Impact on the fire-retardancycitations
- 2013Shear Thinning Three-Dimensional Colloidal Assemblies of Chitosan and Poly(lactic acid) Nanoparticlescitations
- 2012Structural Regime Identification in Ionotropic Alginate Gels: Influence of the Cation Nature and Alginate Structurecitations
- 2011Nanostructured Organic-Inorganic Hybrid Films Prepared by the Sol-Gel Method from Self-Assemblies of PS-b-PAPTES-b-PS Triblock Copolymerscitations
- 2010Micron Range Morphology of Physical Chitosan Hydrogels
- 2010Dielectric properties of polyamide 6-montmorillonite nanocompositescitations
- 2010Morphology and Viscoelasticity of PP/TiO2 Nanocomposites Prepared by In Situ Sol-Gel Methodcitations
- 2009Structure of Natural Polyelectrolyte Solutions : Role of the Hydrophilic/Hydrophobic Interaction Balancecitations
- 2009Mechanisms involved during the ultrasonically-induced de-polymerization of chitosan: Characterization and control
- 2009Mechanisms Involved During the Ultrasonically Induced Depolymerization of Chitosan: Characterization and Controlcitations
- 2008Influence of alpha-ZrP fillers and process conditions on the morphology and the gas barrier properties of filled PA6 films
- 2008Nanostructure of calcium alginate aerogels obtained from multistep solvent exchange routecitations
- 2008Metal nanocomposite films prepared in situ from PVA and silver nitrate. Study of the nanostructuration process and morphology as a function of the in situ routes
- 2007Orientation of uniaxially stretched poly(ethylene naphthalene 2,6-dicarboxylate) films by polarized infrared spectroscopy
- 2007Thermo-mechanical behavior of uniaxially drawn and crystallized poly(ethylene naphthalene-2,6-dicarboxylate) (PEN) films
- 2007In situ generation of active nanoparticles in polymer films: control of the functional properties by the control of the nanocomposite film morphology
- 2007Structure and dynamic/compositional heterogeneity in polycyanurate: Poly (tetramethylene glycol) hybrid networks
- 2007Multifunctionnal covalent and ionic coupling of maleic anhydride modified polyethylene
- 2007Physical aging and molecular mobility of amorphous polymerscitations
- 2007Polyelectrolyte microstructure in chitosan aqueous and alcoholic solutions
- 2007Morphology and texture development of uniaxially stretched poly(ethylene naphthalene-2,6-dicarboxylate
- 2007Structure and morphology of nanocomposite films prepared from polyvinyl alcohol and silver nitrate: influence of thermal treatment
- 2005Deformation of steel powder compacts during sintering: Correlation between macroscopic measurement and in situ microtomography analysis
- 2005Viscoelastic properties and morphological characterization of silica/polystyrene nanocomposites synthesized by nitroxide-mediated polymerizationcitations
Places of action
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article
Polyelectrolyte microstructure in chitosan aqueous and alcoholic solutions
Abstract
This work deals with chain ordering in aqueous and water−alcohol solutions of chitosan. The so-called polyelectrolyte peak is investigated by small-angle synchrotron X-ray scattering. The polyelectrolyte microstructure was characterized by the position of the maximum of the polyelectrolyte scattering peak qmax, which scales with the polymer concentration cp as qmax cpα. An evolution of the power law exponent α is observed as a function of the degree of acetylation (DA) of chitosan, which is responsible for changes of both the charge density (f) and the hydrophobicity of the polymer chains. The results highlighted the two organization regimes of the theory of Dobrynin and Rubinstein,1 investigated here for the first time for a natural polymer. At low DAs, α ≈ 1/2, in agreement with a pearl necklace organization where the structure is controlled by the string between pearls. For higher DA, α ≈ 1/3, and the correlation revealed by the polyelectrolyte peak is controlled by the pearls. This analysis offers a way to study quantitatively the balance between solvophobic−solvophilic interactions that play an important role in the solution properties of natural polymers. In addition, the role of several parameters acting on the interaction balance were evidenced, such as the nature of the counterion, the composition of the solvent (amount of alcohol in the aqueous solution), and the screening of Coulombic forces by salt addition. Finally, the nanostructure transition from a polyelectrolyte solution to a physical gel is discussed. The gel state is reached when the solvophobic interactions are favored, but depending on the gelation route the polyelectrolyte ordering could be preserved or not.